[OPENMP]Set default version to OpenMP 4.5.

Since clang fully supports OpenMP 4.5, set the default version to 4.5
instead of 3.1.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@368172 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Frontend/CompilerInvocation.cpp

@@ -2894,8 +2894,8 @@ static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
     }
   }
 
-  // Check if -fopenmp is specified.
-  Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 1 : 0;
+  // Check if -fopenmp is specified and set default version to 4.5.
+  Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 45 : 0;
   // Check if -fopenmp-simd is specified.
   bool IsSimdSpecified =
       Args.hasFlag(options::OPT_fopenmp_simd, options::OPT_fno_openmp_simd,

lib/Frontend/InitPreprocessor.cpp

@@ -1032,18 +1032,18 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
     switch (LangOpts.OpenMP) {
     case 0:
       break;
+    case 31:
+      Builder.defineMacro("_OPENMP", "201107");
+      break;
     case 40:
       Builder.defineMacro("_OPENMP", "201307");
       break;
-    case 45:
-      Builder.defineMacro("_OPENMP", "201511");
-      break;
     case 50:
       Builder.defineMacro("_OPENMP", "201811");
       break;
     default:
-      // Default version is OpenMP 3.1
-      Builder.defineMacro("_OPENMP", "201107");
+      // Default version is OpenMP 4.5
+      Builder.defineMacro("_OPENMP", "201511");
       break;
     }
   }

test/OpenMP/driver.c

@@ -15,9 +15,12 @@
 // RUN: %clang %s -c -E -dM -fopenmp=libomp -fopenmp-version=1 | FileCheck --check-prefix=CHECK-DEFAULT-VERSION %s
 // RUN: %clang %s -c -E -dM -fopenmp=libomp -fopenmp-version=0 | FileCheck --check-prefix=CHECK-DEFAULT-VERSION %s
 // RUN: %clang %s -c -E -dM -fopenmp=libomp -fopenmp-version=100 | FileCheck --check-prefix=CHECK-DEFAULT-VERSION %s
-// RUN: %clang %s -c -E -dM -fopenmp=libomp -fopenmp-version=31 | FileCheck --check-prefix=CHECK-DEFAULT-VERSION %s
+// RUN: %clang %s -c -E -dM -fopenmp=libomp -fopenmp-version=45 | FileCheck --check-prefix=CHECK-DEFAULT-VERSION %s
 
-// CHECK-DEFAULT-VERSION: #define _OPENMP 201107
+// CHECK-DEFAULT-VERSION: #define _OPENMP 201511
+
+// RUN: %clang %s -c -E -dM -fopenmp=libomp -fopenmp-version=31 | FileCheck --check-prefix=CHECK-31-VERSION %s
+// CHECK-31-VERSION: #define _OPENMP 201107
 
 // RUN: %clang %s -c -E -dM -fopenmp=libomp -fopenmp-version=40 | FileCheck --check-prefix=CHECK-40-VERSION %s
 // CHECK-40-VERSION: #define _OPENMP 201307

test/OpenMP/parallel_default_messages.cpp

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 -o - %s -Wuninitialized
+// RUN: %clang_cc1 -verify=expected,ge40 -fopenmp -ferror-limit 100 -o - %s -Wuninitialized
 // RUN: %clang_cc1 -verify=expected,ge40 -fopenmp-simd -ferror-limit 100 -o - %s -Wuninitialized
 // RUN: %clang_cc1 -verify=expected,ge40 -fopenmp-version=50 -fopenmp -ferror-limit 100 -o - %s -Wuninitialized
 // RUN: %clang_cc1 -verify=expected,ge40 -fopenmp-version=40 -fopenmp -ferror-limit 100 -o - %s -Wuninitialized